Re: [Intel-gfx] [PATCH 1/4] drm: add picture aspect ratio flags

Daniel Vetter
2016-08-04T16:04:58Z

On Thu, Aug 04, 2016 at 06:35:52PM +0530, Sharma, Shashank wrote:
> Thanks Daniel.
>
> My comments, inline.
>
> Regards
> Shashank
> On 8/4/2016 4:06 PM, Daniel Vetter wrote:
> > On Thu, Aug 04, 2016 at 03:46:09PM +0530, Sharma, Shashank wrote:
> > > Hello Emil,
> > >
> > > Thanks for your time.
> > >
> > > I have got mixed opinion on this.
> > >
> > > IMHO we should expose them to userspace too, as UI agents like Hardware
> > > composer/X/Wayland must know what does these
> > >
> > > flags means, so that they can display them on the end user screen (like
> > > settings menu)
> > >
> > > But few people even think thats its too complex to be exposed to userspace
> > > agents.
> > >
> > > So your suggestions are welcome.
> > These are flags for the internal mode representation, not for the uapi
> > one. They really don't belong into the uapi header, but instead into
> > include/drm/drm_modes.h. I.e. I fully concur with Emil.
> > -Daniel
> Please correct me if I am missing anything, but In that case, how will HWC/X
> apply a modeset
> 1920x1080@60 16:9 (Not 1920x1080@60 4:3)

Argh sorry, I mixed up the two mode structures again. You're correct.
-Daniel

>
> Regards
> Shashank
> > > Regards
> > > Shashank
> > >
> > > On 8/4/2016 3:12 PM, Emil Velikov wrote:
> > > > On 3 August 2016 at 11:56, Shashank Sharma <shashank.sharma@intel.com> wrote:
> > > >
> > > > > --- a/include/uapi/drm/drm_mode.h
> > > > > +++ b/include/uapi/drm/drm_mode.h
> > > > > +
> > > > > +/* Aspect ratio flag bitmask (4 bits 22:19) */
> > > > > +#define DRM_MODE_FLAG_PARMASK (0x0F<<19)
> > > > > +#define DRM_MODE_FLAG_PARNONE \
> > > > > + (DRM_MODE_PICTURE_ASPECT_NONE << 19)
> > > > > +#define DRM_MODE_FLAG_PAR4_3 \
> > > > > + (DRM_MODE_PICTURE_ASPECT_4_3 << 19)
> > > > > +#define DRM_MODE_FLAG_PAR16_9 \
> > > > > + (DRM_MODE_PICTURE_ASPECT_16_9 << 19)
> > > > >
> > > > Afaict all these flags are internal/implementation specific thus we
> > > > shouldn't expose them to userspace. Right ?
> > > >
> > > > -Emil
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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